Below you can see the front view size comparison of Nikon D5300 and Canon 700D. Nikon D5300 is clearly the smaller of the two cameras. Its body is 8mm narrower, 2mm shorter and 3mm thinner than Canon 700D.
Nikon D5300 vs Canon 700D - Front View
Nikon D5300 vs Canon 700D - Top View
The chart below depicts how two cameras compare with average dimensions of the cameras in their class.
Camera Size Comparison
Select Two Cameras for Size Comparison